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- I f 2 Sheets-Sheet 1'. J. DENNIS. V

(Model!) VISE.

Patented Sept. 5, 1882.

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'(ModeL) No. 263.872. Patented Sept. 5, 1882.

7 7) nesis ea,

N TERS. Phnmmhowa her. Washinglall. D. C.

To all whom it may concern:

- UNITED STATES PATENT OFFICE.

, JOHN DENNIS, OF LOWELL, MASSACHUSETTS.

VISE.

SPECIFICATION forming part of Letters Patent No. 263,872, dated September 5, 1882.

Application filed July 6, 1882.

to the accompanying drawings, and to the letters of reference marked thereon, making a part of this specification.

This invention relates to certain improvements in vises of that class known' as treadle vises, and it consists in certain combinations and arrangements of the parts, as more fully hereinafter specified, and pointed out in the claims.

In the aocompanyingdrawings,Figure 1 represents a side elevation of my improved vise;

Fig. 2, a similar view with the side removed,

showing the interior working parts of the vise; and Fig. 3 represents a plan view of the device. Fig. 4: shows a vertical sectional view of my improved device on the line 00 00 of Fig. 2; Fig. 5, a horizontal sectional view of a modification of my device; and Fig. 6, a detached view in section on line 3 y, showing the combination of the parts whereby they are held in normal position.

The letter A designates the treadle, and B a rod connecting the trcadle to atoggle-lever, (l, inclosed in a casing, D, said toggle-lever being adapted to give the inner jaw a forward movement. The toggle is fastened to the casingD at G and to the innerjaw, H, at I by means of pins, the pins securing the endI passing through a slot in the casing. Thejaw H is slotted and plays loosely over the casing D, and is provided with a shank which extends downward to the floor, where it works in a hearing, K, as indicated in Fig. 1. of the drawings.

The letter L indicates a pawl pivoted upon a pin, M. The pawl is provided with a projection, N, at its forward end and with teeth I? at its rear, which are adapted to engage the ratchet on the shank of the outer jaw when the toggle-lever is depressed, so as to force the jaws together, the projection serving to release the pawlwhen the toggle-lever is elevated by means of the spring B. On the lower end of the shank of the inner jaw are formed a series of ratchet-teeth, S, with which the edge of the treadle A may be caused to engage in order to (Model lock the jaws of the vise upon the work. The toggle is provided with arms T, bent at the ends, and adapted to engage the pins U on the pawl, in order that the pawl may be caused to engage the ratchet on the shank of the outer jaw. The rod B is provided with a rubber cushion or washer, V, to provide an elastic movement.

The operation of my invention is as follows: As the toggle-lever descends the spring is compressed and the innerjaw is thrown slightly forward, which permits the pawl to drop by its own weight into the rack attached to the outer jaw. This arrests the outer jaw, and as the toggle-lever still further descends the object between the jaws is clamped by the movement of the inner jaw, which is pressed forward with great force. When the treadle is released from the rack on the shank of the innerjaw the spring automatically elevates the toggle-lever, which pulls the inner jaw back, and this in turn lifts the pawl, which leaves the outer jaw and rack at liberty to slide freely.

As represented in the drawings, the vise is intended for metal-work; but it can be adapted to wood-work, for carpenters, wheelwrights, cabinet-makers, and others,by making thejaws straight and placing lugs on the top of the casing, so that it can be easily attached to the underside of the bench instead of the top, so as to be out of the way.

The casing, it is evident, will protect the working parts from inj ury,and from dust, chips, and other foreign substances which would tend to clog and interfere with their proper operation.

As shown in Fig. 2 of the drawings, the

spring R sets in a socket in the enlarged part of one of the arms 0 of the toggle-lever. In the modification shown in Fig. 5 of the drawings the spring sets in a recess in the shell of the device, each arm of the bifurcated. portion of the rod B being secured to a lug on one of the levers O, which is adapted to be brought to bear upon the spring when the rod B is depressed and be returned by said spring to normal position when released.

Having thus described my invention, what I claim, and desire to secure by Letters. Patent, 1s

1. In combination with the jaws of the vise and the inclosin g casing, the toggle-lever adaptadapted to engage a ratchet on the shank of provided with pins which the bent arms ongage, and the jaw having a shank provided with a rack, the whole arranged to operate 15 substantially as and for the purposes specified.

In testimony whereofl affix my signature, in presence oftwo Witnesses, this Gthday of April,

ed to be operated as described, and the pawl the outer jaw when operated by the togglelever, substantially as set forth.

. 2. In combination with thejaws, the casing, the toggle-lever and its actuating devices, and

the pawl, the spring for returning the parts to 1882.

a normal position, substantially as and for the purposes set forth. JOHN DENNIS 3. In combination with the trcadle and con- Witnesses:

nectingrod, the rubber cushion V, the togglelever and spring, the bentarms, and the pawl MARTIN L. HAMBLET, J. NELsoN DENNIS. 

